Two weeks after our Prime Minister told us he will be attending the coronation of Charles III we still don’t know for sure if Prince Harry will show up. But I can reveal that until very recently the attendance of both senior Sussexes was a racing certainty. The tell-all memoir of her husband having failed to tell anyone anything they didn’t already know, Meghan saw that it was unlikely to generate much more revenue, and that to secure the entitlements of their progeny (the naming of one of whom for Harry’s grandmother seeming only – and inexplicably – to have...